Split picture layer quads to allow removing more occluded area.

cc/test/layer_test_common.cc

Index: cc/test/layer_test_common.cc
diff --git a/cc/test/layer_test_common.cc b/cc/test/layer_test_common.cc
index d023a8a9f356c8aaea5aaec7894a728404f41106..6a63f696eb40f5b35c213b0da866418bec11929c 100644
--- a/cc/test/layer_test_common.cc
+++ b/cc/test/layer_test_common.cc
@@ -86,6 +86,7 @@ void LayerTestCommon::VerifyQuadsExactlyCoverRect(const QuadList& quads,
 // static
 void LayerTestCommon::VerifyQuadsAreOccluded(const QuadList& quads,
                                              const gfx::Rect& occluded,
+                                             bool split_quads,
                                              size_t* partially_occluded_count) {
   // No quad should exist if it's fully occluded.
   for (auto* quad : quads) {
@@ -115,9 +116,9 @@ void LayerTestCommon::VerifyQuadsAreOccluded(const QuadList& quads,
                                      target_rect.right() <= occluded.right();
     bool fully_occluded_vertical = target_rect.y() >= occluded.y() &&
                                    target_rect.bottom() <= occluded.bottom();
-    bool should_be_occluded =
-        target_rect.Intersects(occluded) &&
-        (fully_occluded_vertical || fully_occluded_horizontal);
+    bool should_be_occluded = target_rect.Intersects(occluded);
+    if (!split_quads && !(fully_occluded_vertical || fully_occluded_horizontal))
+      should_be_occluded = false;
     if (!should_be_occluded) {
       EXPECT_EQ(quad->rect.ToString(), quad->visible_rect.ToString());
     } else {